{"product_id":"rfid-dual-frequency-13-56mhz-125khz-read-write-module-uart-t5577","title":"RFID Dual Frequency 13.56MHz 125KHz Read\/Write Module UART T5577","description":"\n\u003ch2\u003eLIHTNE T7941W Dual-Frequency RFID Read\/Write Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eLIHTNE T7941W\u003c\/strong\u003e is a compact, high-performance dual-frequency RFID read\/write module that handles both \u003cstrong\u003e13.56 MHz (IC)\u003c\/strong\u003e and \u003cstrong\u003e125 KHz (ID)\u003c\/strong\u003e card protocols in a single unit. Whether you're building an access control system, an automation project, or an embedded IoT solution, this versatile module communicates via a simple \u003cstrong\u003eUART serial interface\u003c\/strong\u003e and supports a wide range of card standards including ISO\/IEC 14443A, NTAG, Mifare S50\/S70, and T5577 rewritable cards.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual-Frequency Operation:\u003c\/strong\u003e Reads and writes both 13.56 MHz and 125 KHz cards in one module — no need for separate readers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Protocol Support:\u003c\/strong\u003e Compatible with ISO\/IEC 14443 A\/MF, NTAG, S20, S50, S70, F1108, EM4100 (read-only), and T5577 (read \u0026amp; write).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimple UART Interface:\u003c\/strong\u003e Easy integration with microcontrollers (Arduino, Raspberry Pi, STM32, etc.) via standard TX\/RX pins.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Measures just 47 mm × 26 mm × 5 mm — ideal for space-constrained enclosures.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRobust Operating Temperature:\u003c\/strong\u003e Reliable performance from -25°C to 85°C for demanding environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRead Range:\u003c\/strong\u003e MF1 cards \u0026gt;3 cm; EM cards \u0026gt;5 cm.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Power Consumption:\u003c\/strong\u003e Operates at DC 5V with only 50 mA current draw.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background:#f5f5f5;\"\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003eT7941W\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003eDC 5V\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f5f5f5;\"\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eCurrent Consumption\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e50 mA\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eFrequencies\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e13.56 MHz \u0026amp; 125 KHz\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f5f5f5;\"\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eRead Range\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003eMF1 \u0026gt;3 cm; EM \u0026gt;5 cm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003eUART (TX \/ RX)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f5f5f5;\"\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e47 mm × 26 mm × 5 mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e-25°C to 85°C\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f5f5f5;\"\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border:1px solid #ccc; padding:6px;\"\u003eMade in China\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePin Connection Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5V\u003c\/strong\u003e — DC 5V power supply (linear power supply recommended for best performance)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRX\u003c\/strong\u003e — UART receive pin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTX\u003c\/strong\u003e — UART transmit pin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGND\u003c\/strong\u003e — Power supply ground\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIO\u003c\/strong\u003e — Configurable I\/O pin\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSupported UART Command Set\u003c\/h3\u003e\n\u003cp\u003eThe module uses a structured binary protocol with a 2-byte header, address byte, command byte, data length, data payload, and XOR checksum for reliable communication.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ccode\u003e0x10\u003c\/code\u003e — Read UID number\u003c\/li\u003e\n  \u003cli\u003e\n\u003ccode\u003e0x11\u003c\/code\u003e — Write UID number (4 bytes, default password)\u003c\/li\u003e\n  \u003cli\u003e\n\u003ccode\u003e0x12\u003c\/code\u003e — Read specified sector\u003c\/li\u003e\n  \u003cli\u003e\n\u003ccode\u003e0x13\u003c\/code\u003e — Write specified sector\u003c\/li\u003e\n  \u003cli\u003e\n\u003ccode\u003e0x14\u003c\/code\u003e — Modify Group A or Group B password\u003c\/li\u003e\n  \u003cli\u003e\n\u003ccode\u003e0x15\u003c\/code\u003e — Read ID number\u003c\/li\u003e\n  \u003cli\u003e\n\u003ccode\u003e0x16\u003c\/code\u003e — Write T5577 card data\u003c\/li\u003e\n  \u003cli\u003e\n\u003ccode\u003e0x17\u003c\/code\u003e — Read all sector data (Mifare 1K card)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSend header: \u003ccode\u003e0xAB 0xBA\u003c\/code\u003e | Return header: \u003ccode\u003e0xCD 0xDC\u003c\/code\u003e | Success: \u003ccode\u003e0x81\u003c\/code\u003e | Failure: \u003ccode\u003e0x80\u003c\/code\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× RFID Dual-Frequency Read\/Write Module (T7941W)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLearn More About RFID Technology\u003c\/h3\u003e\n\u003cp\u003eFor a deeper understanding of RFID standards and frequency bands, visit the \u003ca href=\"https:\/\/www.nist.gov\/publications\/guidelines-securing-radio-frequency-identification-rfid-systems\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eNIST Guidelines for Securing RFID Systems\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between 13.56 MHz and 125 KHz RFID, and does this module support both?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — this dual-frequency RFID module supports both 13.56 MHz (high-frequency, used for Mifare\/ISO14443A cards like S50, S70, NTAG) and 125 KHz (low-frequency, used for EM4100 and T5577 cards). The 13.56 MHz band offers higher data transfer speeds and better security features, while 125 KHz cards are common in older access control systems. This module handles both in a single compact unit.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I connect this RFID module to an Arduino or Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: Connect the module's \u003cstrong\u003e5V\u003c\/strong\u003e pin to your board's 5V supply, \u003cstrong\u003eGND\u003c\/strong\u003e to ground, \u003cstrong\u003eTX\u003c\/strong\u003e to the microcontroller's RX pin, and \u003cstrong\u003eRX\u003c\/strong\u003e to the microcontroller's TX pin. The module communicates via standard UART serial protocol, making it straightforward to integrate with Arduino, Raspberry Pi, ESP32, STM32, and similar platforms using the documented binary command set.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I rewrite T5577 cards with this module?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The T7941W specifically supports T5577 card writing via UART command \u003ccode\u003e0x16\u003c\/code\u003e, allowing you to clone or overwrite 125 KHz card data onto rewritable T5577 blanks — a common requirement in access control development and testing.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the maximum read range for this RFID module?\u003c\/h4\u003e\n\u003cp\u003eA: The read range is approximately \u003cstrong\u003e3 cm for Mifare (MF1) cards\u003c\/strong\u003e and \u003cstrong\u003e5 cm for EM-type cards\u003c\/strong\u003e. Using a linear (regulated) power supply instead of a switching supply can help improve overall signal stability and detection consistency.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this module suitable for industrial environments?\u003c\/h4\u003e\n\u003cp\u003eA: The T7941W is rated for an operating temperature range of \u003cstrong\u003e-25°C to 85°C\u003c\/strong\u003e, making it suitable for a wide range of environments including light industrial, outdoor enclosures, and embedded systems where temperature variation is a concern.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between 13.56 MHz and 125 KHz RFID, and does this module support both?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — this dual-frequency RFID module supports both 13.56 MHz (high-frequency, used for Mifare\/ISO14443A cards like S50, S70, NTAG) and 125 KHz (low-frequency, used for EM4100 and T5577 cards). The 13.56 MHz band offers higher data transfer speeds and better security features, while 125 KHz cards are common in older access control systems. This module handles both in a single compact unit.\"}}, {\"@type\": \"Question\", \"name\": \"How do I connect this RFID module to an Arduino or Raspberry Pi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Connect the module's 5V pin to your board's 5V supply, GND to ground, TX to the microcontroller's RX pin, and RX to the microcontroller's TX pin. The module communicates via standard UART serial protocol, making it straightforward to integrate with Arduino, Raspberry Pi, ESP32, STM32, and similar platforms using the documented binary command set.\"}}, {\"@type\": \"Question\", \"name\": \"Can I rewrite T5577 cards with this module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The T7941W specifically supports T5577 card writing via UART command 0x16, allowing you to clone or overwrite 125 KHz card data onto rewritable T5577 blanks — a common requirement in access control development and testing.\"}}, {\"@type\": \"Question\", \"name\": \"What is the maximum read range for this RFID module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The read range is approximately 3 cm for Mifare (MF1) cards and 5 cm for EM-type cards. Using a linear (regulated) power supply instead of a switching supply can help improve overall signal stability and detection consistency.\"}}, {\"@type\": \"Question\", \"name\": \"Is this module suitable for industrial environments?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The T7941W is rated for an operating temperature range of -25°C to 85°C, making it suitable for a wide range of environments including light industrial, outdoor enclosures, and embedded systems where temperature variation is a concern.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"RFID Dual Frequency 13.56MHz 125KHz Read\/Write Module UART T5577\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/products\/rfid-dual-frequency-13-56mhz-125khz-read-write-module-uart-t5577\"}]}\u003c\/script\u003e","brand":"Vue","offers":[{"title":"Default Title","offer_id":48751833088192,"sku":"\u003cnone\u003e","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/9338\/7968\/files\/HTB168RfBZyYBuNkSnfoq6AWgVXam.webp?v=1786242159","url":"https:\/\/vueselect.com\/products\/rfid-dual-frequency-13-56mhz-125khz-read-write-module-uart-t5577","provider":"Vue","version":"1.0","type":"link"}